Features: Applicable Scenes: Ergonomically designed to fit small to large hand sizes. perfect for men, women, seniors, and teens.  42mm diameter round, entity pointer display, clear scale, auto zero. Design for athletes and sports enthusiasts who want to increase their hand, wrist, forearm, and finger strength for rock climbing, shooting, bodybuilding, golf, tennis, etc.  The wide range of tensions makes the hand exerciser a popular choice for those with arthritis, rheumatoid arthritis, tendonitis, carpal tunnel, tennis elbow, and those recovering from a broken wrist and tendon surgery.  Great hand strengthener for musicians including drummers as well as guitar, piano, and violin players.  Hand Grip Strengthener only, other accessories demo in the picture is not included.     Specification: Material: ABS.  Packing Size: app.18.5x8.5x3cm/7.28x3.35x1.18in.  Optional Color: Blue, Gray.  Quantity: 1 Pc.     Package Contents: 1 x Hand Grip Strengthener